docs: def ls(ctx, name):
      """List EMR instances"""
      session = create_session(ctx.obj['AWS_PROFILE_NAME'])
  
      client = session.client('emr')
      results = client.list_clusters(
          ClusterStates=['RUNNING', 'STARTING', 'BOOTSTRAPPING', 'WAITING']
      )
      for cluster in results['Clusters']:
          click.echo("{0}\t{1}\t{2}".format(cluster['Id'], cluster['Name'], cluster['Status']['State']))